------- Comment From hbath...@in.ibm.com 2016-08-25 06:05 EDT------- Can we expect upstream crash utility commits 6f1f78e33474 & 098cdab16dfa included in crash package for the next update?
Thanks Hari -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to crash in Ubuntu. https://bugs.launchpad.net/bugs/1607894 Title: Unable to analyse vmcore/dump via crash due to bad kernel debug info build Status in crash package in Ubuntu: New Bug description: == Comment: #0 - NAVEED A. UPPINANGADY SALIH - 2016-07-01 02:41:07 == ---Problem Description--- Unable to analyse vmcore/kernel dumpfile generated by 4.4.0-29-generic kernel with ddeb kernel debuginfo available in http://ddebs.ubuntu.com/pool/main/l/linux/ http://ddebs.ubuntu.com/pool/main/l/linux/linux-image-4.4.0-29-generic-dbgsym_4.4.0-29.48_ppc64el.ddeb ---uname output--- 4.4.0-29-generic #48~14.04.1-Ubuntu SMP Wed Jun 29 19:55:03 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux Machine Type = model : 8247-22L machine : PowerNV 8247-22L ---Steps to Reproduce--- # crash /usr/lib/debug/boot/vmlinux-4.4.0-29-generic /var/crash/201606300840/dump.201606300840 crash 7.0.3 ... This GDB was configured as "powerpc64le-unknown-linux-gnu"... crash: invalid kernel virtual address: 61c2555c09c17994 type: "possible" WARNING: cannot read cpu_possible_map crash: invalid kernel virtual address: 8a0f6ddee20c4116 type: "present" WARNING: cannot read cpu_present_map crash: invalid kernel virtual address: 5a09344e320a1886 type: "online" WARNING: cannot read cpu_online_map WARNING: cannot read linux_banner string crash: /usr/lib/debug/boot/vmlinux-4.4.0-29-generic and /var/crash/201606300840/dump.201606300840 do not match! Userspace rpm: linux-image-4.4.0-29-generic- dbgsym_4.4.0-29.48_ppc64el.ddeb == Comment: #5 - Naresh Bannoth - 2016-07-27 04:12:09 == The Latest kernel I am having is as follows root@ltcalpine-lp6:~# uname -a Linux ltcalpine-lp6 4.4.0-31-generic #50~14.04.1-Ubuntu SMP Wed Jul 13 01:03:56 UTC 2016 ppc64le ppc64le ppc64le GNU/Linux root@ltcalpine-lp6:~# ====>>> the issue same as posted originally. ... This GDB was configured as "powerpc64le-unknown-linux-gnu"... crash: invalid kernel virtual address: 61c2555c09c17994 type: "possible" WARNING: cannot read cpu_possible_map crash: invalid kernel virtual address: 8a0f6ddee20c4116 type: "present" WARNING: cannot read cpu_present_map crash: invalid kernel virtual address: 5a09344e320a1886 type: "online" WARNING: cannot read cpu_online_map WARNING: cannot read linux_banner string crash: /usr/lib/debug/boot/vmlinux-4.4.0-31-generic and /var/crash/201607270248/dump.201607270248 do not match! == Comment: #6 - Hari Krishna Bathini - 2016-07-28 11:49:31 == The kernel is compiled with gcc version 4.8.4 while the vmlinux pulled from http://ddebs.ubuntu.com/pool/main/l/linux/ is compiled with gcc version 5.3.1 which is the source of the issue. Resolved this by pulling the kernel debug symbols package from: deb http://ddebs.ubuntu.com/ -updates main which indeed has the vmlinux compiled with gcc version 4.8.4. But I got this error: crash: invalid structure member offset: module_num_symtab FILE: kernel.c LINE: 3049 FUNCTION: module_init() after the update owning to couple of missing patches listed below: commit 6f1f78e33474d00d5f261d7ed9d835c558b34d61 Author: Dave Anderson <ander...@redhat.com> Date: Wed Jan 20 09:56:36 2016 -0500 Fix for the changes made to the kernel module structure introduced by this kernel commit for Linux 4.5 and later kernels: commit 7523e4dc5057e157212b4741abd6256e03404cf1 module: use a structure to encapsulate layout. Without the patch, the crash session fails during initialization with the error message: "crash: invalid structure member offset: module_init_text_size". (seb...@linux.vnet.ibm.com) commit 098cdab16dfa6a85e9dad2cad604dee14ee15f66 Author: Dave Anderson <ander...@redhat.com> Date: Fri Feb 12 14:32:53 2016 -0500 Fix for the changes made to the kernel module structure introduced by this kernel commit for Linux 4.5 and later kernels: commit 8244062ef1e54502ef55f54cced659913f244c3e modules: fix longstanding /proc/kallsyms vs module insertion race. Without the patch, the crash session fails during initialization with the error message: "crash: invalid structure member offset: module_num_symtab". (ander...@redhat.com) Applying the above patches on top of crash tool version 7.0.3-3ubuntu4.4, was able to analyze the dump. The patches apply cleanly.. Thanks Hari == Comment: #8 - Naresh Bannoth - 2016-07-29 06:59:23 == Verified with 4.4.0-31-generic kernel. on Applying the patches mentioned in the #C 6, it is working fine. I took the Compiled Binary attached in the BUG and able to analyse the Dumpfile without any issues. Thanks Naresh == Comment: #9 - Hari Krishna Bathini - 2016-07-29 07:47:25 == To sum this up, two things to make this work: 1. Install debug symbols package from here deb http://ddebs.ubuntu.com/ trusty main restricted universe multiverse deb http://ddebs.ubuntu.com/ trusty-security main restricted universe multiverse deb http://ddebs.ubuntu.com/ trusty-updates main restricted universe multiverse deb http://ddebs.ubuntu.com/ trusty-proposed main restricted universe multiverse instead of http://ddebs.ubuntu.com/pool/main/l/linux/ as the gcc versions don't match. 2. Use a crash binary that has the upstream patches 6f1f78 & 098cda Thanks Hari To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1607894/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
